Consumer Price Index (CPI) rate of inflation published in January, plus 3.9%

[Phil177]

A 7.9% increase, following a 14.4% increase last March, what a total and utter joke of a company, inflation is 4% and a company making vast profits(unable to find theirs or the BT Group) profits for 2023 can pick and choose how much to increase their bills by and expect their customers will put up with it. A contract should be just that, you agree a price for the period of the contract!! Maybe after many years it’s time to take my business elsewhere!! 

[bristolian]

Annual inflation-linked price increases are commonplace across the telecoms industry and written into the contract you have agreed & accepted.

Your argument about fixed-price contracts is one you should take up with the Ofcom, for the industry regulator allows this practice.